The rapid pace of change in American life does not exempt politics. Witness how fast Democrats are cycling through scapegoats.

First came Hillary Clinton. When she emerged to gripe about all the reasons she lost last year, except herself, party activists told her to be quiet and go away. She has, for now.

Next came Nancy Pelosi. When Republicans won four contested special elections for House seats, disgruntled Dems turned their fire on their minority leader, telling Pelosi it was time to get out of the way. She refuses, for now.

And now comes Barack Obama. The former president, shredding what was left of his promise not to interfere with his successor, is joining the fight against the repeal of ObamaCare. He called the Senate bill an example of “meanness,” and pledged to campaign for the Democrat in the Virginia governor’s race.